过共晶铝硅合金中Al-Si-Mn-Fe相的形态影响因素

摘要

An investigation was carried out into the characteristics of an Al-22%Si alloy with the elevated content of Fe and Mn. The effects of different Mn/Fe on the morphology of the Al-Si-Mn-Fe phase in the alloy were compared. The experimental results indicated that the acicular Al-Si-Mn-Fe phase changed into grainy one and became small with the increase in the cooling speed and the rise of manganese content.%在Al-22% Si合金中分别加入0.96% Fe，0.67% Mn和1% Fe，1.50% Mn；用浇注不同厚度的试样并观察金相组织的方法，了解和比较了不同Mn/Fe比和不同冷却速度对于合金中Al-Si-Mn-Fe相形态的影响。研究结果表明，随着Mn含量和冷却速度的提高，针状铁相转变为粒状并得到细化。